Patent US3131026A successfully refreshed from Google Patents.
US3131026A
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US
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Purification of zinc sulfide powder
Assignee: Eastman Kodak Co
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Filing: 1961-09-14
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Granted: 1964-04-28
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Expires: 1981-09-14
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward Carnall
- 👤 Leroy S Ladd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:26
CPC Classifications
C; C01; C01G; C01G9/00; C01G9/08; C04; C04B; C04B35/00; C04B35/515; Y; Y10; Y10S; Y10S264/00; Y10S264/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A METHOD OF PURIFYING ZINC SULFIDE POWDER TO IMPROVE THE TRANSPARENCY OF ARTICLES HOT PRESSED THEEFROM COMPRISING SUBJECTING THE ZINC SULFIDE POWDER TO AN OXIDIZING ATMOSPHERE AT A TEMPERATURE WITHIN THE RANGE BETWEEN 370-480*C., THEREAFTER HEATING THE ZINC SULFIDE POWDER AT A TEMPERATURE BETWEEN 460-650*C. WHILE PASSING HYDROGEN SULFIDE OVER THE POWDER, AND FINALLY MAINTAINING THE ZINC SULFIDE POWDER WITHIN THE SAME TEMPERATURE RANGE OF 460-650*C. IN THE PRESENCE OF HYDROGEN.
Claim 2
Independent Claim
71 words
A METHOD OF PURIFYING ZINC SULFIDE POWDER TO IMPROVE THE TRANSPARENCY OF ARTICLES HOT PRESSED THEEFROM COMPRISING SUBJECTING THE ZINC SULFIDE POWDER TO AN OXIDIZING ATMOSPHERE AT A TEMPERATURE WITHIN THE RANGE BETWEEN 370-480*C., THEREAFTER HEATING THE ZINC SULFIDE POWDER AT A TEMPERATURE BETWEEN 460-650*C. WHILE PASSING HYDROGEN SULFIDE OVER THE POWDER, AND FINALLY MAINTAINING THE ZINC SULFIDE POWDER WITHIN THE SAME TEMPERATURE RANGE OF 460-650*C. IN THE PRESENCE OF HYDROGEN.
References Cited (Backward Citations)
US2844493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |